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SS2win
August 20th, 2019, 09:00 AM
I've been collecting CAX files 12587603 and noticed the COS 5 is mentioned in the files but it's not on my machine and I can't find anything else on it. Does it exist by special order or are 12225074 and 12212156 the only ones available?
GMPX
August 20th, 2019, 12:51 PM
It does not exist sorry, I'm not sure why there would be a reference to it.
SS2win
August 21st, 2019, 02:06 AM
I've been searching to see if COS5 and flex fuel are at thing but I only see two OS's supported. Am I missing anything?
GMPX
August 21st, 2019, 09:28 AM
If there is only two COS5's on OS's that support FlexFuel then that is what you need to choose from.
SS2win
August 22nd, 2019, 02:44 AM
I only see support for 12225074 and 1221215 in 'C:\Users\New Owner\Documents\EFILIVE\V7.5\Bins\Custom OS" neither of which have flex fuel.
SS2win
August 22nd, 2019, 12:39 PM
Oops! Nevermind... I found some posts that explain the situation and I'm only 10 years or so behind the curve. SNAFU! :)

The reason I was asking is I picked up a 95 Z/28 LT1 Torqhead conversion that has flex fuel and it got me thinking I'd like to update my SS to match. The problem is I don't want to loose my RoadRunner and the only 512M OS that supports flex fuel, 12216125, does not have a COS written for it. So I started looking at 1M PCM's and saw there's no COS5 for them... not the end of the world but between the two features, a pretty big loss to get flex fuel. I can use COS3 but saying bye to my Roadrunner is just sad...

Back when the COS was being developed, I never though twice about it because E85 was rare and the sensors were expensive! I guess there just wasn't enough available room in 12216125 to do it? (not that I expect you to start now but it would be nice lol)
GMPX
August 25th, 2019, 09:30 AM
Yes I remember the sensors were very expensive back then.
However for my own curiosity I had a look at 12216125 and yes indeed that binary is full! Approx 1000 bytes spare in the whole 512K so not enough to do what we need for a COS. Probably why GM started rolling out the 1Mb PCM in 2003.
Highlander
September 29th, 2019, 12:51 PM
This is probably why custom OS wasn't done (of course Ross is correct)... you are looking to do Nitrous with E85? I know it has been done on the 1mb ecms.
SS2win
October 2nd, 2019, 05:34 AM
No just trying to decide on staying with P01 or P59...
Highlander
October 2nd, 2019, 01:24 PM
P59>>>>>>>>>>p01
SS2win
October 5th, 2019, 02:06 AM
sure thing unless you're loosing your roadrunner in the process :P
Highlander
October 5th, 2019, 09:11 AM
I have a roadrunner for a 1mb. As a matter of facts its the same unit, just the PCM is different.
SS2win
October 7th, 2019, 09:49 AM
mine only has 512M memory so its teh end of the road
joecar
October 8th, 2019, 11:02 PM
I have a roadrunner for a 1mb. As a matter of facts its the same unit, just the PCM is different.You have a working 1MB RR...? Very cool and rare :cheers:
SS2win
October 8th, 2019, 11:47 PM
What Motes told me is, it's not the Roadrunner itself, it's that there are so many variations in p59 ECM that they wound up with a poorly selected batch of ECMs which gave them support headaches so they decided to stop selling pre-assembled 1M roadrunners. You should be good to go as long as you have the right ECM for your application.

I don't know why they're not more public about this. It is bad marketing to let a rumor floating around that there 1M version is broken. It took me more than a few emails over a couple of years to finally get the full story out of them. lol
Highlander
October 13th, 2019, 11:24 AM
that is correct

i actually need to send mine for conversion as my ecm has the whole coil circuit dead. But its the development unit for the COS stuff as I can't kill it.